Antidimming composition



J;- 1 a a in ANTIDIMMING COMPOSITION.

No Drawing.

Specification of Letters Patent.

Patented Oct. 25, 1921-.

Application filed January 24, 1921. Serial No. 439,665.

(FILED UNDER. THE ACT or nencn a, 1883, 22 srA'n-L, 625.

To allwkom it may concern:

Be it known that I, HARRY A. KUHN, a citizen of the United States of America, and resident of Edgewood, Maryland, have invented certain new and useful Improvements in; Antidimming Compositions, of which the following is a specification.

This application is made under the act of March 3, 1883, chapter 143 (22 Stat,

625) and the invention herein described and claimed may be used by the Government of the United States or any of its ofiicers or employees in the prosecution of work for the Government, and any person in the United States without the payment to me of any royalty thereon.

This invention relates to a composition for preventing the dimming of lass surfaces, such as windows, wind shiel ds, lenses and the like.

Among the objects of this invention is the provision of a composition which, when applied to a glass surface, will prevent the accumulation of moisture thereon and will described, which is also capable of being taken u by a cloth, felt, or fabric, the saturate or impregnated fabric'to be applied to a surface by rubbing the surface therewith and thereby applying to such surface the anti-dimming composition.

In preparing said composition, I use a salt of a sulfonated vegetable oil and add thereto an alkali with small quantities of a binding material and a mineral oil. Water in sufiicient quantity to make a paste or liquid is also added. The ingredients are heated to about 100 C. until a homogeneous mass is formed.

Among the salts of the sulfonated vegetable oils which I have found suitable for this purpose are those of rape oil, cotton seed oil, corn oil, linseed oil and castor oil.

I have found, however, that the best results are obtalned by using the alkali metal salts of sulfonated rape or cotton seed oils, or m xtures of these. For alkalis the most sultable are the caustic alkalis.

As a binding material, I have found glycerln very satisfactory, especially, if the compos tion is to be made into cakes or soaked 1nto cloth. Sodium silicate also acts well as a binder and when used with glycerin for this purpose improves the composition.

The mineral oil which I have found most sultable for this purpose is engine oil; however, other mineral oils may be substituted therefor. The function of the mineral oil is to give the anti-dimming composition a softer finish and it also adds to the permanency of the film.

A specific example of my composition is as follows Sodium salt of sulfonated rape Oll 80-100 parts NaOH 15-30 Sodium silicate 35 Glycerin 3-5 Engine oil 35 Water 25-100 These substances are heatedtogether until a homogeneous mass is obtained and the mlxture allowed to cool, and prepared either in the form of cakes or paste, or else soaked oil and a binder.

2. An anti-dimming composition comprising the reaction products of an alkali metal salt of a sulfonated vegetable oil, caustic alkali, mineral oil and a binder.

3. An anti-dimming composition comprisin the reaction products of analkali metal sa t of a sulfonated vegetable oil, caustic alkali, mineral oil and glycerin.

4. An anti-dimming composition comprisin the reaction products of an alkali metal sa t of a sulfonated vegetable oil, caustic alkali, mineral oil, glycerin and a soluble silicate.

5. An anti-dimmin composition comprising the reaction pro nets of a salt of sulfonated rape oil, an alkali, a mineral oil and a binder. I

6. An anti-dimming composition comprising the reaction products of salts of sulfonated rape and cotton seed oils, an alkali, a mineral oil and a binder.

7. An anti-dimming composition comprising the reaction products of an alkali metal salt of sulfonated rape oil, caustic alkali, soluble silicate, glycerin, engine oil and water. 7

8. An anti-dimming composition comprising the reaction roducts of an alkali metal sa t of sulfonate vegetable oil 80100 parts, alkali 15-30 parts, mineral oil 3-5 parts and binder 3-5 parts.

9. An anti-dimming composition comprising the reaction roducts of an alkali metal sa t of sulfonate rape oil 80-100 parts, caustic alkali 15-30 parts, water glass 3-5 parts, glycerin 3-5 parts, engine oil 3-5 parts, and water 25400 parts.

10. A fabric impregnated with a composition comprising the reaction products, of a salt of a sulfonated vegetable oil, an alkali, a mineral oil and a binder.

11/ A fabric impregnated with a composition comprising the reaction products of an alkali metal salt of sulfonated rape oil, caustic alkali, soluble silicate, glycerin, engine oil and water.

' HARRY A. KUHN. 

